Door draft check



Sept. 16, 1958 F. J. RYNDERS 2,851,745

DOOR DRAFT CHECK Filed Nov. 19, 1956 INVENTOR FRANK J.RYNDERS ATTORIEIEYS nited States Patent DOOR DRAFT CHECK Frank J Rynders, Milwaukee, Wis. Application November 19, 1956, Serial No. 623,230

1 Claim. (Cl. 20-67) This invention appertains to pivoted closures and more particularly to swinging entrance doors for buildings.

One of the primary objects of my invention is the provision of novel means carried by the lower edge of a door for forming an effective contact with the threshold, whereby to eliminate undesired under-the-door drafts.

Another salient object of my invention is to provide a draft check movably carried by the door with automatic means for raising the check immediately upon the opening of the door, so that the check will be disposed above obstructions and ride over carpets and the like to prevent undue wear thereon.

A further important object of my invention is to provide automatic means for forcibly moving the check to a lowered operative threshold engaging position when the door is moved to its completely closed position.

A still further important object of my invention is to provide a draft check for the lower edges of doors which will be durable and efiicient in use, one that will be simple and easy to manufacture and one which can be placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described and claimed, and illustrated in the accompanying drawing, in which drawing,

Figure 1 is a front elevational view showing my door check applied to a door and with the door in its closed position and the check in its lowered operative position;

Figure 2 is a horizontal sectional view taken on the line 2-2 of Figure 1, looking in the direction of the arrows, the view showing the draft check in top plan;

Figure 3 is an enlarged detail vertical sectional View taken on the line 33 of Figure 1, looking in the direction of the arrows and illustrating more particularly the cam carried by the check and the strike plate carried by the door frame, the check being shown in its lowered position;

Figure 4 is a view similar to Figure 3 but showing the door in a partially opened position with the door check in its raised inoperative position, and

Figure 5 is an enlarged detail vertical sectional view taken on the line 5-5 of Figure 1, looking in the direction of the arrows showing the check in its lowered position and the spring means employed for normally urging the check to a raised inoperative position upon the opening of the door.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter C generally indicates my novel draft check for a door D. The door D can be considered of the ordinary type employed in homes and the like, and is mounted on hinges within a door frame F.

The door frame F is of the usual construction and includes the side framepiece or stiles 11 and 12. The hinges 10 are carried by the stile 11.

The door check C includes a longitudinally extending "ice plate 13 preferably, but not necessarily, formed from metal and this plate is provided with a longitudinally arched portion 14 to strengthen the plate. The plate has rigidly secured thereto by welding or the like, or has formed thereon upstanding arms 15. These arms in turn are rigidly secured to a rock shaft 16. The rock shaft 16 is mounted for swinging movement in bearing brackets 1'7. The outer arms 15 have formed on their upper ends outwardly inclined stop lips 15 which engage the door when the plate 13 is swung up to a raised position, as will later more clearly appear. The hearing brackets are firmly fastened to the desired face of the door D adjacent to the lower edge thereof. Riveted or otherwise fastened to the inner face of the plate 13 is a strip of heavy felt 18 or some similar material. The parts are so positioned on the door that the strip of felt .18 will intimately engage the threshold 19 for the door when the door is in its closed position.

Also secured to the door D is a depending arched leaf spring 20 and the lower end of this spring is riveted or otherwise fastened to the plate 13. This spring is so tensioned as to normally lift up and swing the plate 13 with the felt strip 18 away from the door D to a raised inoperative position.

To bring about the forcible lowering of the plate and the tight engagement of the strip 18 with the threshold 19, when the door is in its completely closed position, I provide a cam 21. This cam is fastened to the rock shaft 16 for turning movement therewith. It is to be noted that the rock shaft 16 extends beyond the free edge of the door D and that the cam 21 is carried by the extended portion of the rock shaft. Hence, when the door is in its completely closed position, one end of the rock shaft will extend over the stile 12. The stile 12 has secured thereto a strike plate 22 so that when the door is in its completely closed position the cam will ride upon this strike plate. The upper inner corner of the cam 21 is provided with a curved cam face 23, the purpose of which will now appear. The inner face of the cam is provided with a flat face 24 directly below the curved cam surface 23 for fitting fiat against the strike plate 22 when the door is in its completely closed position.

In operation of the draft check and considering that the door is in an open position (see Figure 2), then the draft check, i. e., the plate 13, and the strip 18 will be held in a raised position by the spring 20 above the floor. With the plate 13 in its raised position, the cam 21 is tilted so that its curved cam face 23 will be presented to the strike plate 22 when the door is moved I to its completely closed position. Now consider that the door is being swung to its closed positionwhen the door is swung into the door frame the curved surface 23 of the cam will ride on the strike plate 22 and the strike plate will force the cam to a vertical position rocking the shaft 16 against tension of the spring 20 and move the plate 13 to a lowered position with the strip 18 tight against the threshold 19. When the door is again opened, and as soon as the cam rides away from the strike plate, the spring 20 will again immediately move the plate 13 to a raised position. Upward swinging movement of the plate 13 is limited by the engagement of the stop lips on the outer arms 15 with the face of the door D.

Changes in details may be made without departing from the spirit or the scope of this invention, but what I claim as new is:

A draft check for doors of the type mounted for swinging movement within a door frame having a threshold comprising a shaft extending transversely of the door and rockably carried thereby, one end of said shaft extending beyond the free edge of the door, depending arms 3 secured to the rock shaft for movement therewith, a traverselyextending plate secured to the lower ends of the arms mounted below the rock shaft and adjacent to the lower edge of the door, a flexible sealing strip carried by saidplate andadapted to engage the threshold of the door when the door is in its closedposition, a bowedgleaf spring secured at its upper end to the door extending downwardly over the rock shaft and secured at its lower .end to the plate normally holding theplate and itststrip in a raised elevated position, a cam secured to the extended end of the shaft for movement with said shaft, said .cam having a cam curved surface at its upper corner for engagement withv-a strike plate on the door'frame when the .door is moved to its completely closed position: for. rocking the .shaft against the tension 5 of the:spring and for moving the plate .to a lowered 4; position with the strip into sealing contact with the threshold, and an upwardly and angularly extending stop lip carried by at least one of said arms for engaging said door when the plate is in a raised position to limit the upward swinging movement thereof.

References Cited in the file of this patent UNITED STATESPATENTS 554,980 Brown Feb. 18, 1896 695,993 Allen Mar. 25, 1902 2,053,793 Johnson Sept. 8, 1936 2,625,718 Ketcham Jan. 20, 1953 FOREIGN PATENTS Great Britain May 24, 1949 

